Radio communication system, radio terminal, radio network, radio communication method and program

ABSTRACT

A wireless communication system comprises: a setting notifying means for notifying, to a radio terminal, setting information related to at least one of the radio terminal&#39;s collection of measurement information and the radio terminal&#39;s reporting of the measurement information to a radio network; a status notifying means for notifying, to the radio network, a status related to at least one of the radio terminal&#39;s collection of the measurement information and the radio terminal&#39;s reporting of the measurement information; and a re-establishing means for receiving the status and determining whether to re-establish the setting information.

This is a continuation of U.S. patent application Ser. No. 16/127,411filed Sep. 11, 2018, which is a continuation application based on U.S.patent application Ser. No. 15/789,297 filed Oct. 20, 2017, issued asU.S. Pat. No. 10,237,771 on Mar. 19, 2019, which is a continuationapplication based on U.S. patent application Ser. No. 14/610,384, filedJan. 30, 2015, issued as U.S. Pat. No. 10,231,142 on Mar. 12, 2019,which is a divisional application based upon U.S. patent applicationSer. No. 13/519,268 filed Jun. 26, 2012, now abandoned, which is aNational Stage of International Application No. PCT/JP2011/050048 filedJan. 5, 2011, claiming priority based on Japanese Patent Application No.2010-002366 filed Jan. 7, 2010, the contents of all of which areincorporated herein by reference in their entirety.

TECHNICAL FIELD

The present invention relates to a radio communication system, a radioterminal, a radio network, a radio communication method, and a programtherefor.

BACKGROUND ART

It is being investigated in a 3GPP (3rd Generation Partnership Project)to cause radio terminals to measure/report information conventionallycollected by drive-tests or information similar hereto so as to reduceoperation cost (OPEX) that is needed for the drive-tests (Drive-Test) tobe performed by operators (Non-patent literature 1). The final goal ofthis investigation is to minimize execution of the drive-tests(Minimization of Drive-Tests: MDT. It is also called a substitute forthe drive test (Drive Test Substitution)). In the feasibility study ofthe MDT, how the radio terminals are caused to measure the informationand how the radio terminals are caused to report a log of themeasurement results and the past measurement results are beingdiscussed. Currently, the periodical reporting technique and the eventtriggered measurement reporting technique are specified. Additionally,what is herein called “the measurement” by the radio terminal alsoincludes an operation of “detecting” some situations.

In the periodical technique, a radio network (for example, a radio basestation) previously notifies a measurement interval and/or a reportinterval to the radio terminal, and the radio terminal performs themeasurement and/or the reporting according hereto. Herein, as theperiodic measurement, there exist the periodical quality measurements ofthe downlink pilot signals (Periodical downlink pilot measurements).

In the technology of the Non-patent literature 1, the radio terminalperiodically performs the received quality measurement of the downlinkpilot signals of serving cells (Periodical downlink pilot measurement),and periodically reports the measurement result. Herein, the so-calledreceived quality measurement of the pilot signals is equivalent tomeasuring RSRP (Reference Signal Received Power), RSRQ (Reference SignalReceived Quality), CPICH RSCP (Common Pilot channel Received Signal CodePower), CPICH Ec/No (Ec: received energy per chip, No: Noise powerdensity), and the like.

The details of the Non-patent literature 1 will be explained with 3GPPLTE (Long Term Evolution) exemplified by referencing FIG. 20.

The radio terminal (UE: User Equipment) notifies a function the radioterminal itself supports to the radio base station (eNB: enhanced NodeB) (UE capability report).

An upper station (EPC: Evolved Packet Core, for example, NM: NetworkManager), out of the radio networks, notifies a measurement policy(Measurement policy) to the eNB (Policy indication), and the eNB givesan instruction for the measurement and the reporting to the UE accordingto the above policy (Measurement logging and reporting configuration).Herein, it is assumed that the measurement and the reporting areperformed at an interval T1 and at an interval T2, respectively.

The UE performs the received quality measurement of the downlink pilotsignals (for example, the RSRP) and the positioning at the interval T1,maintains the measurement and the measurement result as a log (Logging),and reports the above log to the eNB at the interval T2 (Measurementreport). In addition, the eNB reports the report coming from the UE tothe upper NW (log report).

Hereinafter, likewise, the UE repeats a series of the operations of themeasurement/positioning—the logging—the reporting.

Herein, for determining a lapse of the interval T1/T2, for example, atimer is used. Further, the UE finishes the above series of theoperations when the UE is instructed to do so, for example, by the eNB.

Additionally, in some cases, for not only a serving cell but also aneighboring cell, the received quality measurement of the downlink pilotsignals is performed periodically.

On the other hand, in the event trigger technique, the radio network(for example, the radio base station) previously notifies the condition,being a trigger for the measurement and/or the reporting, to the radioterminal, and the radio terminal performs the measurement and/or thereporting when the above condition is satisfied. Herein, the condition,being the trigger, includes, for example, a broadcast channel receptionerror (Broadcast Channel Failure), a paging channel reception error(Paging Channel Failure), the received quality of the serving cellbecoming worse than a predetermined threshold (Serving Cell becomesworse than threshold), extra transmit power being less than apredetermined threshold (Transmit power headroom becomes less thanthreshold), a failure of a random access (Random access failure), andthe like (Non-patent literature 2). Additionally, the radio terminalreports information of the time as well responding to a necessity whenthe trigger has occurred together with the measurement result.

In addition, the radio terminal having a positioning function isinstructed to perform the positioning as well periodically or a timepoint when the trigger has occurred, and to report location information.

In the technology of the Non-patent literature 2, the radio terminalperforms the measurement (and the positioning) when the event istriggered, stores the result of the measurement (and the positioning) asthe log, and reports it when the event is triggered. Herein, it isassumed that the condition under which the trigger of the measurementoccurs is the paging channel reception error (Paging Channel Failure),and the radio terminal performs the received quality measurement of thedownlink pilot signals of the serving cell at this time. Further, it isassumed that the condition under which the trigger of the reportingoccurs is a time point when a predetermined amount of the logs have beenaccumulated, and the radio terminal reports the log to the radio networkat this time.

The details of the technology of the Non-patent literature 2 will beexplained with the 3GPP LTE exemplified by referencing FIG. 21.

The UE notifies functions the UE itself supports to the eNB (UEcapability report).

The EPC (for example, NM) notifies a measurement policy (Measurementpolicy) to the eNB (Policy indication), and the eNB gives an instructionfor the measurement and the reporting to the UE according to the abovepolicy (Measurement logging and reporting configuration). Herein, it isassumed that the trigger of the measurement is the paging channelreception error, and the trigger of the reporting is a time point whenthe amount of the logs (a memory capacity of the terminal used for thelogs) has reached a predetermined value.

The UE periodically receives the paging channels, performs the receivedquality measurement (for example, the RSRP) of the downlink pilotsignals of the serving cell and the positioning thereof according to theabove instruction when the paging channel reception error (PagingChannel Failure) occurs, and maintains the measurement result and thepositioning result together with the time of the occurrence of thepaging channel reception error as the log (Logging). And, when theamount of the logs has reached a predetermined value, the UE reports theabove logs to the eNB (Measurement report). In addition, the eNB reportsthe report coming from the UE to the upper NW (Log report).

Hereinafter, likewise, the UE repeats a series of the operations of themeasurement/positioning—the logging—the reporting.

Herein, the UE finishes the above series of the operations when the UEis instructed to do so, for example, by the eNB.

Additionally, in some cases, for not only the serving cell but also theneighboring cell, the received quality measurement of the downlink pilotsignals when the trigger of the measurement occurs is performedperiodically.

CITATION LIST Non-Patent Literature

-   NON-PTL 1: 3GPP TR36.805v1.2.0    (internet<http://www.3gpp.org/ftp/Specs/html-info/36805.htm>)-   NON-PTL 2: 3GPP R2-094291    (internet<http://www.3gpp.org/ftp/tsg_ran/WG2_RL2/TSGR2_67/Docs/R2-094191.zip>)

SUMMARY OF INVENTION Technical Problem

In the above-described technologies, the radio terminal performs themeasurement/the reporting as instructed by the radio network. However,the measurement/the reporting for the MDT is basically a supportfunction that the radio network expects for the radio terminal, and itis also thinkable that the measurement/the reporting is an excessiveoperation from a viewpoint of the radio terminal. For this, thefollowing points at issue are expected.

When the radio terminal performs the periodical measurement/reportinglike the case of the Non-patent literature 1, it always performs themeasurement/the reporting at an indicated timing, whereby a battery isconsumed due to transmitting the information that the above radioterminal originally does not need to transmit and a load on the terminalbecomes large particularly when a remaining battery charge is few.Further, it will also be a problem that there is a possibility thatreported information cannot be effectively utilized in a radio networkside because a reliability of location information is low when apositioning error is large, and resultantly, an unnecessary load isinflicted on the radio terminal.

Further, in a case of performing the measurement/the reporting when theevent is triggered like the case of the Non-patent literature 2, forexample, the radio terminal that stays in an environment in which thepaging channel reception error more easily occur results in performingthe measurement/the positioning and the reporting more frequently. Forthis, when the radio terminal of which a remaining battery charge isfew, as described above, stays in such an environment, a load on theterminal becomes large. Further, the communication quality in thecircumstance such that a paging channel reception error occurs is bad,and it will be a problem that a load on the terminal becomes largebecause a large radio resource is necessary for reporting a log.

Thereupon, the present invention has been accomplished in considerationof the above-mentioned problems, and an object thereof is to provide aradio communication system, a radio terminal, a radio network, a radiocommunication method, and a program therefor capable of collectinginformation that the radio network side requires while alleviating aload on the terminal caused by the measurement/positioning and/or thereporting, and/or deleting the reporting of the information with a lownecessity.

Solution to Problem

The present invention is a radio communication system, comprising:configuration notifying means that notifies a radio terminal ofconfiguration information related to at least one of collection ofmeasurement information and reporting of said measurement information toa radio network by the radio terminal; status notifying means notifiessaid radio network of a status related to at least one of the collectionand the reporting of said measurement information by said radioterminal; and reconfiguring means that receives said status, anddetermines whether or not to reconfigure said configuration information.

The present invention is a radio communication system, comprising:status notifying means that notifies a status related to at least one ofcollection and reporting of measurement information by a radio terminal;and controlling means that receives said status, and controls at leastone of the collection of the measurement information and the reportingof said measurement information to a radio network by said radioterminal.

The present invention is a radio terminal, comprising: receiving meansthat receives configuration information related to at least one ofcollection of measurement information and reporting of said measurementinformation to a radio network; and status notifying means notifies saidradio network of a status related to at least one of the collection andthe reporting of said measurement information by its own terminal,wherein when the configuration information reconfigured by said radionetwork having received said status is transmitted from said radionetwork, said receiving means receives the above configurationinformation.

The present invention is a radio terminal in a communication system forcontrolling, by a radio network, at least one of collection ofmeasurement information and reporting of said measurement information tothe radio network by the radio terminal, comprising a status notifyingmeans that notifies a status related to at least one of the collectionand the reporting of said measurement information by its own terminal tosaid radio network.

The present invention is a radio communication method, comprising:notifying a radio terminal of configuration information related to atleast one of collection of measurement information and reporting of saidmeasurement information to a radio network by the radio terminal;notifying said radio network of a status related to at least one of thecollection and the reporting of said measurement information by saidradio terminal; and receiving said status and determining whether or notto reconfigure said configuration information.

The present invention is a radio communication method, comprising:notifying a status related to at least one of collection and reportingof measurement information by a radio terminal to a radio network; andreceiving said status, and controlling at least one of the collection ofthe measurement information and the reporting of said measurementinformation to the radio network by said radio terminal.

The present invention is a radio network, comprising: configurationnotifying means that notifies a radio terminal of configurationinformation related to at least one of collection of measurementinformation and reporting of said measurement information to a radionetwork by the radio terminal; and reconfiguring means that receives,from said radio terminal, a status related to at least one of thecollection and the reporting of said measurement information by saidradio terminal, and determines whether or not to reconfigure saidconfiguration information.

The present invention is a program for causing an information processingdevice to execute the processes of: notifying a radio terminal ofconfiguration information related to at least one of collection ofmeasurement information and reporting of said measurement information toa radio network by the radio terminal; receiving from said radioterminal a status related to at least one of the collection and thereporting of said measurement information by said radio terminal; andreceiving said status, and determining whether or not to reconfiguresaid configuration information.

Advantageous Effect of Invention

The present invention makes it possible to collect information that theradio network side requires while alleviating a load on the terminalcaused by the measurement/positioning and/or the reporting, and/ordeleting the reporting of the information with a low necessity.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a functional constitution view of this exemplary embodiment.

FIG. 2 is a sequence diagram for explaining a specific operation of afirst exemplary embodiment.

FIG. 3 is a constitution view of the radio communication system in asecond exemplary embodiment.

FIG. 4 is a block diagram of a radio terminal (UE) 30.

FIG. 5 is a block diagram of a radio base station (eNB) 31.

FIG. 6 is a block diagram of an NM 32.

FIG. 7 is a sequence diagram for explaining a specific operation of thesecond exemplary embodiment.

FIG. 8 is another sequence diagram for explaining a specific operationof the second exemplary embodiment.

FIG. 9 is an operational flowchart of the radio terminal (UE) 30.

FIG. 10 is an operational flowchart of the radio base station (eNB) 31.

FIG. 11 is a sequence diagram for explaining an operation of a thirdexemplary embodiment.

FIG. 12 is an operational flowchart of the radio terminal (UE) 30.

FIG. 13 is an operational flowchart of the radio base station (eNB) 31.

FIG. 14 is a sequence diagram for explaining an operation of a fourthexemplary embodiment.

FIG. 15 is an operational flowchart of the radio terminal (UE) 30.

FIG. 16 is an operational flowchart of the radio base station (eNB) 31.

FIG. 17 is a sequence diagram for explaining a specific operation of afifth exemplary embodiment.

FIG. 18 is a sequence diagram for explaining a specific operation of amodified example of the fifth exemplary embodiment.

FIG. 19 is a constitution view of the radio communication system in asixth exemplary embodiment.

FIG. 20 is a view for explaining the technology related to the presentinvention.

FIG. 21 is a view for explaining the technology related to the presentinvention.

DESCRIPTION OF EMBODIMENTS

The exemplary embodiments of the present invention will be explained.

Characteristics of this exemplary embodiment are that the radio terminalnotifies a status of the radio terminal itself to the radio network, theradio network controls the measurement and/or the reporting of themeasurement log, which corresponds to a log of measurement results, bythe radio terminal, according to the above notified status.

Herein, the so-called status is a status related to at least one of themeasurement and the reporting of the measurement logs, which correspondto the logs of the measurement results, by the radio terminal, and aconcept including a terminal situation of the radio terminal and acollection situation of the measurement logs, and the like.Additionally, the above status is briefly described as “a measurementstatus” in the following. Further, as the terminal situation of theradio terminal, there exist the remaining battery charge of the radioterminal (an absolute value of the remaining battery charge, a quantizedvalue thereof, an identification number (ID No.) previously associatedwith the remaining battery charge, a memory capacity of the battery, andthe like), location information of the radio terminal (GPS, Cell, TA:Tracking Area, information of the outdoors/indoors, or locationinformation acquired by other location information detecting means (forexample, OTDOA: Observed Time Difference Of Arrival Technique)), acommunication quality (for example, RSRP, RSRQ, CPICH RSCP, and CPICHEc/No), a moving velocity (speed) (an absolute value of the movingvelocity, a quantized value thereof, an ID No. previously associatedwith the moving velocity, a pre-specified level of the moving velocity,and the like), received strength of a GPS radio wave, and the like.

Further, as the collection situation of the measurement logs, thereexist a sort of the measurement log (for example, a pre-specified IDNo., a category, and the like), an amount of the measurement log (thenumber of times of the measurements, a memory usage amount of the radioterminal (UE memory usage), and the like), a summary of the measurementlogs (for example, a sort of the measurement log, respective numbers oftimes of the measurements for the above sort of the measurement log,information of the time when the measurement has been performed,information of the location in which the measurement has been performed(GPS, Cell, TA: Tracking Area), information of the outdoors/indoors, andthe like), the moving velocity, positioning performance information (apositioning error, a positioning accuracy and the like) and the like,but the collection situation is not limited hereto.

Herein, it is thinkable that the information of the outdoors/indoors canbe acquired from, for example, whether the received strength of theradio wave to be used for acquiring the location information such as theGPS radio wave is equal to or more than a predetermined value, or lessthan it, whether the radio terminal is connected to an in-housesmall-size base station that is called HNB (Home NodeB) or HeNB (HomeeNodeB) (detectable with PCI: Physical Cell ID), and the like. Further,with the moving velocity, the case in which the moving velocity can beactually measured with an acceleration sensor etc. mounted, and the casein which the moving velocity is estimated based on the number (orfrequency) of handovers or the number (or frequency) of cellre-selections are thinkable.

Additionally, as a measurement (or detection) target for which the radioterminal stores the result as the measurement log, there exists theperiodical quality measurement of the downlink pilot signals (Periodicaldownlink pilot measurements), the broadcast channel reception error(Broadcast Channel Failure), the paging channel reception error (PagingChannel Failure), the received quality of the serving cell becomingworse than a predetermined threshold (Serving Cell becomes worse thanthreshold), the extra transmit power being less than a predeterminedthreshold (Transmit power headroom becomes less than threshold), thefailure of the random access (Random access (RA) failure), the radiolink disconnection (Radio Link Failure: RLF), and the like. Further,with the case of the broadcast channel reception error (BroadcastChannel Failure), the paging channel reception error (Paging ChannelFailure), the received quality of the serving cell becoming worse than apredetermined threshold (Serving Cell becomes worse than threshold), theextra transmit power being less than a predetermined threshold (Transmitpower headroom becomes less than threshold), the failure of the randomaccess (RA failure), and the radio link disconnection (RLF), it is alsothinkable to acquire the communication quality (for example, the RSRP,the RSRQ, the CPICH RSCP, and the CPICH Ec/No) of the own cell (Servingcell) and/or the neighboring cells (Neighboring cell (s)) as well. Inaddition, for all items (or one part thereof) that the radio terminalmeasures (or detects), it is also thinkable to log the locationinformation and the time information together where the abovemeasurement (or detection) is performed. Additionally, this is onlyexample, and the application target of the present invention is notlimited hereto.

On the other hand, as the trigger of the radio terminal's performing thereporting of the measurement log, there exists an absolute time(Absolute time based), a request from the radio network (for example,the radio base station) (On demand), periodical expiration of the timer(Periodical timer based), a terminal memory usage amount (an amount ofthe logs) (UE memory usage based), the location of the terminal(Location based), a combination of the above-mentioned items (Combinedtriggers), and the like; however, the trigger is not limited hereto.

Further, the radio terminal may finish an operation of the measurementand the reporting when a measurement duration or a report durationpreviously notified from the radio network, or the number of times ofthe measurements or the number of times of the reports is satisfied, orwhen an instruction is received from the radio network.

Further, the so-called radio network is constituted of a core network(EPC: Evolved Packet Core or CN: Core Network), in the above radionetworks, a base station controller (RNC: Radio Network Controller),and/or a radio base station (it is denoted as eNodeB, eNB, NodeB, NB,BTS, and the like). The core network includes an NM (Network Manager),and/or a DM (Device Manager), and/or an OMC (Operation and MaintenanceCenter) and the like; however the core network is not limited hereto.

Additionally, in the following, the measurement or the detection, anacquisition operation of information that is executed accordinglyhereto, and an operation in accordance therewith are described (defined)together as “a measurement” except for the case of particularly makingthe explanation in details for classification. Further, the measurementinformation, being information that the radio terminal acquires by useof the above broadly sensed “measurement” and stores, is defined as “ameasurement log”. Further, what is called the collection of themeasurement information signifies the acquisition of the abovemeasurement information, namely signifies an operation of themeasurement and an operation of logging (maintaining) the informationacquired by the above measurement.

FIG. 1 is a functional constitution view of this exemplary embodiment.

As shown in FIG. 1, the radio communication system of this exemplaryembodiment, which is a radio communication system that collects theinformation by causing the radio terminals to measure/report theinformation that the radio network requires, includes a radio terminal 1(UE) and a radio network 2.

The radio terminal 1 (UE) has a logging/reporting capability memory 11(Logging/reporting capability memory), a terminal situation/logsituation reporting function 12 (UE condition/logging status reportingfunction), a measuring & measurement result logging function 13(Measurement/logging function), and a measurement reporting function 14(Measurement reporting function).

The radio network 2 has an OAM (Operation/Administration/Maintenance)policy & OAM requirement enforcement function 21 (OAM policy &requirement enforcement function) and a log storage function 22 (Logstorage).

In the radio communication system of this exemplary embodiment, theradio terminal 1 firstly performs a terminal capability report relatedto a logging capability and a reporting capability (UE capabilityreport). The terminal capability report that is performed herein is areport of notifying a function that radio terminal 1 inherently includes(for example, existence or not of the measurement function of thecommunication quality and the GPS function, or detailed informationrelated hereto). And, the radio network 2 references the above terminalcapability report (UE capability report), decides the measurement methodor the logging method of the measurement result of the above radioterminal 1 (Measurement and logging configuration), and the reportingmethod (Reporting configuration), and gives an instruction to the radioterminal 1.

The radio terminal 1 performs the measurement and logs the measurementresult according to the instructed measurement method and loggingmethod. Thereafter, the radio terminal 1 performs the reporting of thelog of the measurement result (measurement log) to the radio network 2according to the instructed reporting method. (Measurement log report).Additionally, as a measurement (or detection) target that the radioterminal 1 maintains as the log, there exist the periodical qualitymeasurement of the downlink pilot signals (Periodical downlink pilotmeasurements), the broadcast channel reception error (Broadcast ChannelFailure), the paging channel reception error (Paging Channel Failure),the received quality of the serving cell becomes worse than apredetermined threshold (Serving Cell becomes worse than threshold), theextra transmit power being less than a predetermined threshold (Transmitpower headroom becomes less than threshold), the failure of the randomaccess (Random access failure), the radio link disconnection (Radio LinkFailure: RLF), and the like.

In this exemplary embodiment, in addition, the radio terminal 1 reportsthe above-described measurement status (Measurement status) at apredetermined timing to the radio network 2 (Measurement status report).Additionally, now upon mentioning the timing at which the radio terminalperforms the measurement status report (Measurement status report), thetiming simultaneously with the terminal capability report (UE capabilityreport) or the timing just after it, the timing at a time point when themeasurement or the reporting is triggered, the timing at a time pointwhen a predetermined event for reporting the measurement status hasoccurred, the timing previously indicated by the radio network, and thelike are thinkable. Additionally, when reporting the measurement statusat a time point when the reporting is triggered (Measurement statusreport), the radio terminal 1 may perform the reporting of themeasurement status (Measurement status report) before performing themeasurement log report (Measurement log report) in some cases, or mayperform the reporting of the measurement status (Measurement statusreport) and the measurement log report (Measurement log report)simultaneously.

Additionally, the predetermined event for reporting the measurementstatus could be identical to an event for reporting the measurement login some cases, or may be configured independently.

However, the trigger for performing the measurement status report(Measurement status report) is not limited hereto. For example, as acondition, being the trigger of the radio terminal's notifying themeasurement status (Measurement status report), the absolute time(Absolute time based), the request from the radio network (On demand),the periodical expiration of the timer (Periodical timer based), aterminal memory usage amount (an amount of the logs) (UE memory usagebased), the location of the terminal (Location based), a combinationthereof (Combined triggers), and the like are thinkable. Additionally,at the moment that the radio network 2 notifies an instruction forconfiguring the measurement method or the logging method of themeasurement result of the radio terminal 1 (Measurement and loggingconfiguration) and an instruction for configuring the reporting method(Reporting configuration), and the like, these conditions under whichthe trigger occurs may be incorporated into these notifications in somecases, or the above conditions may be notified with the other methods insome cases. Further, the condition under which the trigger occurs may bepreviously configured for the radio terminal.

The radio network 2 gives an instruction for reconfiguring themeasurement method and the logging method in the radio terminal 1(Measurement and logging re-configuration), and/or an instruction forreconfiguring the reporting method of the radio terminal 1 (Reportingre-configuration) responding to a necessity based on the reportedmeasurement status (Measurement status report) so that a load of themeasurement or the reporting on the radio terminal 1 does not becomeexcessive. That is, the measurement status is transmitted to the radionetwork 2 for a purpose of reconfiguring the configuration instruction(Measurement and logging configuration) of the above-describedmeasurement method or logging method of the measurement result, theconfiguration instruction of the reporting method (Reportingconfiguration), and the like. Specifically, the measurement status istransmitted to the radio network 2 for a purpose of causing the radionetwork 2 to determine whether or not the reconfiguration of theconfiguration instruction of the measurement method or the loggingmethod of the measurement result (Measurement and loggingconfiguration), the configuration instruction of the reporting method(Reporting configuration), and the like is needed. In such a manner, theradio terminal 1 transmits the measurement status to the radio network2, thereby enabling the radio network 2 to take into consideration asituation of the radio terminal and a situation related to theinformation collection by the radio terminal.

Additionally, it is thinkable that the above reconfiguration instructionincludes any instruction of a change of at least one value of parametersnotified by the above configuration instruction, an addition of newparameters not notified by the above configuration instruction, and anabort of the measurement and/or the reporting. Or, the notification ofthe new messages related to the instruction notified by the aboveconfiguration instruction and the like are also thinkable.

This makes it possible to collect the information that the radio networkside requires while alleviating a load on the terminal caused by themeasurement, the logging of the above measurement result and/or thereporting, and/or deleting the reporting of the information with a lownecessity.

Additionally, the above-described message to be transmitted from theradio terminal to the radio network, and the above-described message tobe transmitted from the radio network to the radio terminal can berealized with RRC (Radio Resource Control) signaling and MAC (MediumAccess Control) signaling; however the signaling is not limited hereto.

Herein, examples as described below are thinkable as a relationshipbetween the content of the measurement status and a control method ofthe measurement and/or the reporting, and these methods makes itpossible to collect the information that the radio network side requireswhile alleviating a load on the terminal.

-   -   In a case of the measurement status=the remaining battery        charge, the interval of the measurement/reporting is made long        in the periodical measurement/reporting when the remaining        battery charge is few. Or, the measurement/reporting is not        allowed until the remaining battery charge reaches a        predetermined threshold or more. On the other hand, an        occurrence of the reporting trigger is made unlikely in the        measurement/reporting by the event trigger when the remaining        battery charge is few. Or, the reporting is not allowed until        the remaining battery charge reaches a predetermined threshold        or more. The method of aborting the measurement unless the        remaining battery charge reaches a predetermined threshold or        more after a lapse of a predetermined period, and causing the        radio terminal to clear the measurement log, which is common to        both of the periodical measurement/reporting and the        measurement/reporting by the event trigger, is also thinkable.    -   In a case of the measurement status=the location information,        the interval of the measurement/reporting is made long in the        periodical measurement/reporting when the UE stays outsides an        area where radio network side requires the information. The        method of making an occurrence of the measurement trigger and/or        the reporting trigger unlikely in the measurement/reporting by        the event trigger when the UE stays outsides an area where radio        network side requires the information, and the like are        thinkable.    -   In a case of the measurement status=the communication quality,        the interval of the measurement/reporting is made short in the        periodical measurement/reporting when the communication quality        is low. The method of facilitating an occurrence of the trigger        of the measurement/reporting in the measurement/reporting by the        event trigger when the communication quality is low, and the        like are thinkable.    -   In a case of the measurement status=a moving velocity, the        interval of the measurement/reporting is made long in the        periodical measurement/reporting when the moving velocity is        slow. The method of making an occurrence of the trigger of the        measurement/reporting unlikely in the measurement/reporting by        the event trigger when the moving velocity is slow and the like        are thinkable.    -   In a case of the measurement status=the received strength of the        GPS radio wave, the interval of the measurement/reporting is        made long in the periodical measurement/reporting when the        received strength is weak. The method of making an occurrence of        the trigger of the measurement/reporting unlikely in the        measurement/reporting by the event trigger when the received        strength is weak, and the like are thinkable.    -   In a case of the measurement status=a sort of the log, the        method of causing the radio terminal to report only the log of a        sort that the radio network side requires at that time point        (the log with a high priority), which is common to both of the        periodical measurement/reporting and the measurement/reporting        by the event trigger, is thinkable.    -   In a case of the measurement status=an amount of the logs (a        memory usage amount of the terminal), the measurement interval        is made long or the report interval is made short in the        periodical measurement/reporting when the amount of the logs are        numerous. The method of making an occurrence of the measurement        trigger unlikely, or facilitating an occurrence of the reporting        trigger in the measurement/reporting by the event trigger when        the amount of the logs are numerous, and the like are thinkable.    -   In a case of the measurement status=a summary of the logs, the        method of causing the radio terminal to report only the log of a        sort with a high priority acquired at a specific location and a        specific point in time, which is common to both of the        periodical measurement/reporting and the measurement/reporting        by the event trigger, is thinkable.    -   In a case of the measurement status=the positioning error        (positioning accuracy), the interval of the        measurement/reporting is made long in the periodical        measurement/reporting when the error is large (the accuracy is        low). The method of making an occurrence of the        measurement/reporting trigger unlikely in the        measurement/reporting by the event trigger when the error is        large (the accuracy is low), and the like are thinkable.    -   In a case of the measurement status=a sort of the log and the        remaining battery charge, the interval of the measurement/report        of the log of a sort with a low priority is made long in the        periodical measurement/reporting when the remaining battery        charge is few. The method of causing the radio terminal to        report only the log of a sort with a high priority in the        measurement/reporting by the event trigger when the remaining        battery charge is few, and the like are thinkable.

However, the above-mentioned controls are only an example, and thecontrol that is enabled by using the present invention is not limitedhereto.

Specific exemplary embodiments will be explained below.

First Exemplary Embodiment

FIG. 2 is a sequence diagram for explaining a specific operation of thefirst exemplary embodiment. In this exemplary embodiment, it is assumedthat, basically, the radio terminal 1 executes an operation according tothe configuration of the collecting method and the reporting method ofthe measurement information to be notified from the radio network 2.

The radio network (NW) 2 notifies the configuration information relatedto the collecting method of the measurement information and thereporting method of (the log of) the measurement information to theradio terminal (UE) 1 (Measurement, recording and logging configuration)(Step 000). The radio terminal (UE) 1 performs the collection of themeasurement information according to the above configuration information(Measurement logging when triggered) (Step 001). The radio terminal (UE)1 reports the measurement status to the radio network (NW) 2 with any ofthe periodical technique and the technique of the event trigger(Measurement status report) (Step 002). The radio network (NW) 2determines whether the reconfiguration of the above configurationinformation is needed based on the above measurement status (Re-configdecision) (Step 003), and notifies, to the radio terminal (UE) 1, theconfiguration information reconfigured for the configuration related tothe collection and the reporting of the measurement information when ithas determined that the reconfiguration is needed (Measurement,reporting and logging reconfiguration) (Step 004). The radio terminal(UE) 1 performs the collection and the reporting of the measurementinformation for the radio network (NW) 2 based on the reconfiguredconfiguration information (Measurement log report) (Step 005).

In such a manner, the radio network (NW) takes into consideration asituation of the radio terminal (UE), a collection situation, and thelike, thereby making it possible to collect desired information withoutinflicting an excessive load on the radio terminal (UE). Herein, theradio network (NW) can perform, for example, optimization of parametersconstituting the radio network, and the like by using the collectedinformation.

Additionally, as a node of the radio network (NW) for performing theoperation in this example, for example, a base station controller (RNC),the radio base station (NB/eNB/BTS), the NM, the DM and the like arethinkable; however the node is not limited hereto.

In addition, specific exemplary embodiments will be explained below.

Second Exemplary Embodiment

The second exemplary embodiment will be explained. The case of supposinga system of the 3GPP LTE (Long Term Evolution) will be explained in thesecond exemplary embodiment.

FIG. 3 is a constitution view of the radio communication system in thesecond exemplary embodiment.

An NM (Network Manager) 32 notifies a policy of the measurement, thelogging of the measurement result, and the reporting of the abovelogging by the terminal to a radio base station (eNB) 31 (Policyindication). As a target of this policy, for example, the minimizationof the drive test (MDT: Minimization of Drive Test. Or it is also calleda substitute for the drive test (Drive Test Substitution)) and the likeare thinkable.

The radio base station (eNB) 31 notifies the configuration informationincluding the measurement method, the logging method, and the reportingmethod (Measurement, logging and reporting configuration) to the radioterminal (UE) 30 based on a policy of the measurement, the logging ofthe measurement result, and the reporting of the above logging (Policyindication).

The radio terminal (UE) 30 reports the log of the measurement result(measurement log) and/or the measurement status to the radio basestation (eNB) 31 (Measurement status report).

The radio base station (eNB) 31 reports all the measurement logsreported from the radio terminal (UE) 30, or one part of the abovemeasurement logs to an upper NM 32 (log report).

Next, a constitution of the radio terminal (UE) 30 will be explained.FIG. 4 is a block diagram of the radio terminal (UE) 30.

A transmitter 301 or a receiver 302 performs the transmission/receptionof signals to/from the radio base station.

A signal processor 303 performs generation of transmissionsignals/demodulation of reception signals.

A communication controller 305 gives an instruction for generating thetransmission signals and recovering the information to the signalprocessor 303.

A terminal capability storage unit 308 is a part for storing thecapability etc. related to the measurement, the positioning, and thereporting of the above terminal, and the capability etc. isappropriately read out responding to a necessity.

A measurement unit 304 measures or detects the target indicated by theradio base station.

A storage unit 307 stores the information measured or detected by themeasurement unit 304, and the above information is read out according toa necessity.

A positioning unit 309 performs the positioning at the moment that themeasurement unit 304 has measured the target indicated by the radio basestation 31. Herein, the positioning includes not only the locationdetection by the GPS etc. but also the reading-out of the information ofthe area (cell, TA and the like) in which the radio terminal stays, theacquisition of the information as to whether the terminal stays outdoorsor indoors, the detection of the location information by the locationinformation acquiring method other than it (for example, an OTDOAtechnique), and the like.

A reporting controller 306 gives an instruction for reporting the storedmeasurement information and location information to the radio basestation 31 when the condition indicated by the radio base station 31 orthe pre-specified condition is satisfied.

Continuously, a constitution of the radio base station (eNB) 31 will beexplained. FIG. 5 is a block diagram of the radio base station (eNB) 31.

A receiver 402 or a transmitter 401 performs the transmission/receptionof signals to/from the radio terminal.

A signal processor 403 performs generation of transmissionsignals/demodulation of reception signals.

A communication controller 405 gives an instruction for generating thetransmission signals and recovering the information, and the like to thesignal processor.

A terminal manager 407 separately manages respective situations of aplurality of the radio terminals.

An interface 406 performs the transmission/reception of the informationto/from an upper station NM 32.

A terminal reporting storage unit 404 is a part for storing themeasurement information etc. reported from the radio terminal 30, andthe stored measurement information and the like are reported to theupper station NM 32 via the interface 406 responding a necessity.

A measurement/reporting controller 408 which is a part for controllingthe measurement/the reporting by the radio terminal based on the policyto be indicated by the upper station NM, furthermore takes the controlof the measurement/reporting in consideration of the reporting of theterminal situation and the collection situation from the radio terminal30 in this exemplary embodiment.

Continuously, a constitution of the NM 32 will be explained. FIG. 6 is ablock diagram of the NM 32.

An OAM manager 501 performs an operation/administration/maintenance ofan entirety of the radio network.

A communication controller 502 performs a control oftransmitting/receiving the information to/from other radio networknodes, for example, the radio base station, via the interface.

A terminal measurement manager 504 decides the information that needs tobe collected, decides a policy for the above collection, and notifies itto the radio base station via an interface 503.

A terminal reporting storage unit 505 stores the measurement informationreported from the radio terminal, and the above measurement informationis read out according to a necessity. The read-out measurementinformation (measurement log) is used for the optimization of the radionetwork and the like.

Next, an operation of the radio system constituted as described abovewill be explained.

FIG. 7 is a sequence diagram for explaining a specific operation of thesecond exemplary embodiment. In this exemplary embodiment, it is assumedthat the measurement/the reporting by the radio terminal (UE) 30 isperiodically performed based on the timer to be notified from the radiobase station (eNB) 31.

Additionally, in the following explanation, it is assumed that themeasurement status report (Measurement status report) is triggered at atiming in which the measurement log report is triggered, namely, at atime point when the timer for reporting the measurement log expires, andan example is explained of making the interval of the measurement and/orthe report long when the remaining battery charge of the radio terminal(UE) 30 is less than a predetermined value.

At first, the radio terminal (UE) 30 performs the terminal capabilityreport (UE capability report) (Step 100).

The NM 32 notifies the measurement policy (Measurement policy) to theradio base station (eNB) 31 (Policy indication) (Step 101).

The radio base station (eNB) 31 gives an instruction for configuring themeasurement method and the reporting method (Measurement logging andreporting configuration) to the radio terminal (UE) 30 according to theabove policy (Step 102). At this time, the radio base station (eNB) 31sends a timer value (Timer value) of a measurement interval Tm (Msmntinterval Tm) at which the measurement is performed, and a timer value(Timer value) of a report interval Tr (Report interval Tr) at which thelog is reported.

The radio terminal (UE) 30 performs the measurement at the measurementinterval Tm (Msmnt interval Tm) based on the notified timer value andlogs the measurement result according to the instructed measurementmethod and the reporting method (Measurement logging) (Step 103). As atiming in which the timer starts, the timing just after notificationfrom the radio base station (eNB) 31 (Step 102), the timing after alapse of a predetermined period since the above notification, and thelike are thinkable.

The radio terminal (UE) 30 reports the remaining battery charge of itsown radio terminal (Step 105) as the measurement status report(Measurement status report) when the timer of the report interval Tr(Report interval) expires (Step 104). And, the radio terminal (UE) 30may notify a transmission buffer situation (Buffer status) togethertherewith.

The radio base station (eNB) 31 determines whether the remaining batterycharge of the radio terminal (UE) 30 is equal to a predeterminedthreshold or more (Re-config decision) based on the measurement statusreport (Measurement status report) (Step 106).

When the remaining battery charge of the radio terminal (UE) 30 is equalto a predetermined threshold or more, the radio base station (eNB) 31keeps the measurement interval Tm (Msmnt interval Tm) and the reportinterval Tr (Report interval Tr) as they are. On the other hand, whenthe remaining battery charge of the radio terminal (UE) 30 is less thanthe predetermined threshold, the radio base station (eNB) 31 decides anew measurement interval Tm′ (Msmnt interval Tm′>Tm) and a new reportinterval Tr′ (Report interval Tr′>Tr) that are intervals longer than themeasurement interval Tm (Msmnt interval Tm) and the report interval Tr(Report interval Tr), respectively. And, the radio base station (eNB) 31notifies an instruction for reconfiguring these intervals (Measurementlogging and reporting reconfiguration) and a radio resource (UL grant)with which the logged measurement result is reported (Step 107).

The radio terminal (UE) 30 transmits the measurement log report to theradio base station (eNB) 31 with the received radio resource(Measurement log report) (Step 108). And, the radio base station (eNB)31 transmits the received measurement logs to the NM 32 (Log report)(Step 109).

On the other hand, when receiving the reconfiguration notification, theradio terminal (UE) 30 reconfigures the notified new measurementinterval Tm′ (Msmnt interval Tm′) and report interval Tr′ (Reportinterval Tr′), and performs the measurement and the reporting at theseintervals thereafter (Step 110).

This makes it possible to cause the radio terminal to perform themeasurement and the reporting without (excessively) increasing a load onthe radio terminal.

Additionally, while it was assumed that the trigger of the measurementstatus report (Measurement status report) was a timing in which themeasurement log report was triggered in the above-described explanation,the above trigger is not limited hereto. For example, the timing of themeasurement status report (Measurement status report) may be configuredindependently depending on the periodical technique, the technique ofthe event trigger, and the like. In addition, in a case of the eventtrigger, the event could be identical to an event used for reporting themeasurement log in some cases, or could be different in some cases.

Further, while the measurement log report was performed after themeasurement status report in the above-described explanation, themeasurement log report may be partially performed simultaneously withthe measurement status report.

In addition, while an example in which the measurement log report(Measurement log report) was performed periodically was explained in theabove-described explanation, in a case in which the measurement logreport is performed when the event is triggered, an occurrence of atrigger of the measurement log report (Measurement log report) is madeunlikely if the remaining battery charge is few. Or, a control is takenin such a manner that the measurement log report (Measurement logreport) is not allowed until the remaining quantity of the battery hasreached a predetermined threshold or more. Further, a control can betaken in such a manner that the radio terminal is caused to abort themeasurement and to clear the measurement log unless the remainingbattery charge reaches a predetermined threshold or more after a lapseof a predetermined period.

Additionally, in FIG. 7, the timing at which the NM 32 notifies (Policyindication) the measurement policy (Measurement policy) to the radiobase station (eNB) 31 is a timing after receiving the terminalcapability report (UE capability report); however, the timing is notlimited hereto, and other timings such as a timing prior to thereception of the terminal capability report (UE capability report) maybe used. Further, it is enough for the radio base station (eNB) 31 topreviously maintain the measurement policy (Measurement policy), and itis not indispensable that the NM 32 notifies (Policy indication) themeasurement policy (Measurement policy) when the radio base station(eNB) 31 maintains the measurement policy.

FIG. 8 is another sequence diagram for explaining a specific operationof the second exemplary embodiment. In this exemplary embodiment,similarly to an example of FIG. 7, it is assumed that themeasurement/the reporting by the radio terminal (UE) 30 is periodicallyperformed based on the timer to be notified from the radio base station(eNB) 31. Further, it is assumed that the measurement status report(Measurement status report) is triggered at a timing in which themeasurement log report is triggered, namely, at a time point when thetimer for reporting the measurement log has expired.

A difference with an example of FIG. 7 lies in a point that, when theremaining battery charge of the radio terminal (UE) 30 is less than apredetermined value, the radio base station (eNB) lets the radioterminal (UE) 30 abort the measurement and the reporting.

Step 100 to 105, being the operations by the NM 32, the radio basestation (eNB) 31, and radio terminal (UE) 30, respectively, are similarto those of FIG. 7. When the radio base station (eNB) 31, afterreceiving the measurement status report (Measurement status report),recognizes that the remaining battery charge of the above radio terminal(UE) 30 is less than a predetermined value, it decides to let the radioterminal (UE) 30 abort the measurement and the reporting (Re-configdecision) (Step 111), and performs the measurement abort notification(Measurement cancel) (Step 112). When the radio terminal (UE) 30receives the measurement abort notification, it clears the configuredmeasurement method and reporting method, and aborts the measurement andthe reporting (Clear measurement configuration) (Step 113).

Additionally, the radio base station (eNB) 31 may let the radio terminal(UE) 30 abort only the measurement, and report the measurement logs thatthe radio terminal (UE) 30 has already stored, and, in this case, theradio terminal (UE) 30 aborts the measurement and the reporting afterreporting only the above measurement logs that the radio terminal (UE)30 has already stored.

Additionally, while also in FIG. 8, similarly to FIG. 7, the timing atwhich the NM 32 notifies the measurement policy (Measurement policy) tothe radio base station (eNB) 31 (Policy indication) is a timing afterreceiving the terminal capability report (UE capability report), thetiming is not limited hereto, and other timings such as a timing priorto receiving the terminal capability report (UE capability report) maybe used. Further, it is enough for the radio base station (eNB) 31 topreviously maintain the measurement policy (Measurement policy), and itis not indispensable that the NM 32 notifies (Policy indication) themeasurement policy (Measurement policy) when the radio base station(eNB) 31 maintains the measurement policy.

Next, an operation of the radio terminal (UE) will be explained.

FIG. 9 is an operational flowchart of the radio terminal (UE) 30.

At first, the radio terminal (UE) 30 receives the configuration of themeasurement method and the reporting method (Measurement logging andreporting configuration) (Step 200).

The radio terminal (UE) 30 starts the measurement timer with the timervalue of the notified measurement interval Tm (Msmnt interval Tm), andstarts the reporting timer with the notified report interval Tr (Reportinterval Tr) (Step 201).

When the measurement timer has expired (Measurement timer expired?)(Step 202), the radio terminal (UE) 30 performs the measurement and thepositioning (Perform measurement and localization) and restarts themeasurement timer (Restart measurement timer) (Step 203).

Continuously, when the reporting timer has expired (Reporting timerexpired?) (Step 204), the radio terminal (UE) 30 reports the remainingbattery charge of its own terminal (Report remaining battery chargeinformation) as the measurement status (Measurement status report),reports the buffer situation as well (Send buffer status report), andstarts the reporting timer (Restart reporting timer) (Step 205).

The radio terminal (UE) 30 performs the reporting of the log of themeasurement result (measurement log) (Report measurement log) (Step 207)when the reporting of the log of the measurement result (measurementlog) is requested by the radio network side (Report requested by NW?)(Step 206). When the reporting of the log of the measurement result(measurement log) is not requested (for example, receiving the abortnotification, not receiving the report request even after a lapse of acertain period of time since the measurement status report, and thelike), the radio terminal (UE) 30 aborts the measurement.

When the reconfiguration of the timer is requested (Step 208), the radioterminal (UE) 30 performs the reconfiguration of the measurementinterval and the report interval (Reconfiguration and restartmeasurement timer and reporting timer) (step 209).

Next, an operation of the radio base station (eNB) 31 will be explained.FIG. 10 is an operational flowchart of the radio base station (eNB) 31.

At first, the radio base station (eNB) 31 notifies the configuration ofthe measurement method and the reporting method (Measurement logging andreporting configuration) (Step 300).

When the remaining battery charge and the buffer situation are reportedas the measurement status (Measurement status report) from the radioterminal (UE) 30 (Remaining battery charge and buffer status reported?)(Step 301), the radio base station (eNB) 31 determines whether to abortthe measurement request for the radio terminal (UE) 30 (Cancelmeasurement request?) (Step 302). When aborting the measurement request,the radio base station (eNB) 31 transmits a message for aborting themeasurement (Send measurement cancel message) (Step 303).

On the other hand, when not letting the radio terminal (UE) 30 abort themeasurement, the radio base station (eNB) 31 determines whether or notthe reconfiguration of the measurement and the reporting of the radioterminal (UE) 30 is needed (Reconfiguration needed?) (Step 304). When itis not needed, the radio base station (eNB) 31 transmits information ofthe uplink radio resources (UL grant) for reporting the measurement log(Send UL grant) (Step 307).

On the other hand, the radio base station (eNB) 31 reconfigures thetimer value of the measurement timer or the reporting timer (Updatemeasurement and/or reporting timer configuration) when thereconfiguration of the measurement and the reporting of the radioterminal (UE) 30 is needed (Step 306). And, the radio base station (eNB)31 transmits the timer value of the reconfigured measurement timer orthe reporting timer, and the information of the uplink radio resourcefor reporting the measurement log to the radio terminal (UE) (Sendreconfiguration message and UL grant) (Step 306).

Additionally, with regard to “Measurement cancel message” in the exampleof the sequence of this exemplary embodiment, both of the case ofaborting only the measurement, and the case of aborting the measurementand the reporting are thinkable. Further, the case of aborting only thereporting, different from those cases, is also thinkable (for example,Log report cancel message). Further, while the case of simultaneouslyreconfiguring both of the measurement interval and the report intervalwas expected, only one of them may be reconfigured.

Third Exemplary Embodiment

The third exemplary embodiment will be explained. The case of supposinga system of the 3GPP LTE (Long Term Evolution) will be explained in thethird exemplary embodiment. Additionally, each of the radio terminal,the radio base station, and the NM assumes a similar constitution, soexplanation will be performed with concentrating on different points. Inthis exemplary embodiment, it is assumed that the measurement and thereporting by the radio terminal is performed with the event triggerbased on the condition to be notified from the radio base station.

FIG. 11 is a sequence diagram for explaining an operation of the thirdexemplary embodiment.

In the third exemplary embodiment, the case in which the measurementstatus (Measurement status) is a summary of the measurement logs (forexample, a sort of the log, a time and a location in which themeasurement has been performed (GPS, Cell, TA, information of theoutdoors/indoors, and the like), will be explained. Further, the triggerof the radio terminal's reporting the measurement status (Measurementstatus report) is explained as an absolute time (Absolute time) to benotified from the radio base station. And, the case of limiting the logsto a specific log based on the measurement status, and making the radioterminal report it will be explained.

At first, the radio terminal (UE) 30 performs the terminal capabilityreport (UE capability report) (Step 400).

The NM 32 notifies the measurement policy (Measurement policy) to theradio base station (eNB) 31 (policy indication) (Step 401).

The radio base station (eNB) 31 gives an instruction for the measurementand the reporting to the radio terminal (UE) 30 according the abovepolicy (Measurement logging and reporting configuration) (Step 402).This instruction includes an instruction for measuring and logging aquality of the serving cell and/or the neighboring cell (for example,RSRP and RSRQ) and the like, and acquiring and logging the locationinformation and/or the time simultaneously therewith in a case of, forexample, a BCCH error, a PCCH error, RA failure, RLF, and the ServingCell becoming worse than a predetermined threshold, and the time(Absolute time) when the measurement status is notified

The radio terminal (UE) 30 measures pre-decided information and logs theresult according to the above instruction when the measurement istriggered (Measurement logging (e.g. BCCH/PCCH error, RA failure, RLF,and Serving Cell becomes worse than threshold)) (Step 403).

The radio terminal (UE) 30 notifies a summary of the logged measurementlogs, together with the transmission buffer situation when the timecomes to the indicated time (Absolute time) (Measurement status report(logging summary)+Buffer status report) (Step 405). In this case, thetransmission buffer situation may not need to be sent.

The radio base station (eNB) 31 determines whether to limit ameasurement target and a reporting target from a summary of thecollected logs (Step 406). And, when limiting (changing) the measurementtarget and the reporting target, the radio base station (eNB) 31transmits an instruction for reconfiguring the measurement target andthe reporting target to the radio terminal (UE) 30 (Measurement loggingand reporting reconfiguration) (Step 407). Here, the radio base station(eNB) 31 may gives an instruction so that the radio terminal (UE) 30reconfigures not both of the measurement and the reporting, but one ofthem.

The radio terminal (UE) 30 having received an instruction forreconfiguring the measurement and the reporting (Measurement logging andreporting reconfiguration) reports the measurement log, being a target,to the radio base station (eNB) 31 (Step 408). And, the radio basestation (eNB) 31 transmits the received measurement log to the NM 32(Log report) (Step 409).

This makes it possible to cause the radio terminal to perform themeasurement and the reporting without (excessively) increasing a load onthe radio terminal.

Next, an operation of the radio terminal (UE) 30 will be explained. FIG.12 is an operational flowchart of the radio terminal (UE) 30.

Additionally, also in this exemplary embodiment, similarly to the secondexemplary embodiment, the timing at which the NM 32 notifies themeasurement policy (Measurement policy) to the radio base station (eNB)31 (Policy indication) is a timing after receiving the terminalcapability report (UE capability report); however, the timing is notlimited hereto, and other timings such as a timing prior to thereception of the terminal capability report (UE capability report) maybe used. Further, it is enough for the radio base station (eNB) 31 topreviously maintain the measurement policy (Measurement policy), and itis not indispensable that the NM 32 notifies (Policy indication) themeasurement policy (Measurement policy) when the radio base station(eNB) 31 maintains the measurement policy.

At first, the radio terminal (UE) 30 receives the configuration of themeasurement method and reporting method (Measurement logging andreporting configuration) (Step 500).

When the BCCH error, the PCCH error, the RA failure, or the RLF occurs,or when the Serving Cell becomes worse than a predetermined threshold,the radio terminal (UE) 30 starts an operation of performing theindicated measurement (Start measurement triggered by BCCH error or PCCHerror or RA failure or RLF or Serving Cell becomes worse than threshold(Step 501).

When even one trigger, out of these triggers, is met (Measurementtriggered?) (Step 502), the radio terminal (UE) 30 performs theindicated measurement and positioning, and logs the measurement resultand the location information (Log measurement result and performlocalization) (Step 503).

Next, the radio terminal (UE) 30 determines whether the time comes whenthe indicated measurement log report is performed (Time to report?)(Step 504). When the time comes to the time for reporting, the radioterminal (UE) 30 firstly performs the reporting of a summary of the logsas the measurement status, together with the transmission buffersituation (Report measurement logging summary and send buffer statusreport) (Step 505). In this case, the transmission buffer informationmay not need to be sent.

When the measurement log report is requested by the radio network side(for example, the radio base station) after reporting the measurementstatus (Report requested by NW?) (Step 506), the radio terminal (UE) 30confirms whether the reconfiguration has been requested (Receive newconfiguration?) (Step 507). When the reconfiguration has been requested,the radio terminal (UE) 30 reconfigures the measurement method, thelogging method of the measurement result, the reporting method, and thelike (Update measurement, logging, and reporting reconfiguration) (Step508).

And, the radio terminal (UE) 30 reports the measurement log requested atthe time of the reconfiguration (Report requested measurement log) (Step509).

Next, an operation of the radio base station (eNB) 31 will be explained.FIG. 13 is an operational flowchart of the radio base station (eNB) 31.

At first, the radio base station (eNB) 31 notifies the configuration ofthe measurement method and the reporting method (Measurement logging andreporting configuration) (Step 600).

The radio base station (eNB) 31 determines whether a summary of the logsand the buffer situation have been reported as the measurement status(Measurement status) by the radio terminal (UE) 30 (Step 601). When theyhave been reported, the radio base station (eNB) 31 determines whetherto abort the measurement request for the radio terminal (UE) 30 based onthe above measurement status (Cancel measurement request?) (Step 602).When aborting the measurement request, the radio base station (eNB) 31transmits a message for aborting the measurement (Send measurementcancel message) (Step 603).

On the other hand, when the radio base station (eNB) 31 does not abortthe measurement request, it determines whether or not thereconfiguration of the measurement and the reporting of the radioterminal (UE) 30 is needed (Reconfiguration needed?) (Step 604). And,when the reconfiguration of the measurement and the reporting of theradio terminal (UE) 30 is needed (Steps 605, 606, and 607), the radiobase station (eNB) 31 notifies an instruction for the reconfigurationand the information of the uplink radio resource for reporting themeasurement log (Send reconfiguration message and UL grant) (Step 608).

Fourth Exemplary Embodiment

The fourth exemplary embodiment will be explained.

The case of supposing a system of the 3GPP LTE (Long Term Evolution)will be explained in the fourth exemplary embodiment. Here, each of theradio terminal, the radio base station, and the NM assumes a similarconstitution, so explanation will be performed with concentrating ondifferent points. In this exemplary embodiment, it is assumed that themeasurement and the reporting by the radio terminal are performed withthe event trigger based on the condition to be notified from the radiobase station.

In the fourth exemplary embodiment, the case in which the measurementstatus (Measurement status) is a sort of the log (logging sort) and theremaining battery charge of the radio terminal is expected. Further, theexplanation will be done with assuming the trigger of the radioterminal's reporting of the measurement status (Measurement statusreport) as a point in time when the log amount of the radio terminal(amount of logging or UE memory usage) has exceeded a predeterminedthreshold. And, the case of making the radio terminal report only thelog of a sort with a high priority when the remaining battery charge isfew, based on the measurement status will be explained.

FIG. 14 is a sequence diagram for explaining an operation of the fourthexemplary embodiment.

At first, the radio terminal (UE) 30 performs the terminal capabilityreport (UE capability report) (Step 700).

The NM 32 notifies the measurement policy (Measurement policy) to theradio base station (eNB) 31 (Step 701).

The radio base station (eNB) 31 gives an instruction for reconfiguringthe measurement and the reporting to the radio terminal (UE) 30according to the above policy (Measurement logging and reportingconfiguration) (Step 702). At this time, the radio base station (eNB) 31send a predetermined threshold as well with respect to the log amount ofthe radio terminal, being a trigger of the radio terminal's execution ofthe measurement status report (Measurement status report). Additionally,when the measurement log report is periodically performed, the radiobase station (eNB) 31 send the timer value (Timer value) for the reportinterval (Report interval Tr) at which the measurement log is reported.

The radio terminal (UE) 30 performs the measurement and logs themeasurement result according to the notified measurement and reporting(Measurement logging) (Step 703). At this time, the radio terminal (UE)30 may perform the positioning and logs the location information, ifneeded.

When the log amount reaches a predetermined threshold or more (Step704), the radio terminal (UE) 30 reports, with the above log amounttaken as the trigger, the remaining battery charge of its own radioterminal as the measurement status report including a sort of the logand the remaining battery charge and the report of the transmissionbuffer situation (Measurement status report (logging sort and remainingbattery charge) and buffer status report) (Step 705). In this case, thetransmission buffer situation may not need to be notified.

The radio base station (eNB) 31 determines whether the reconfigurationof the measurement method and/or the reporting method is needed (forexample, whether the remaining battery charge of the radio terminal (UE)30 is equal to a predetermined threshold or more, and the like)(Re-config decision) based on the measurement status (Measurement statusreport) (Step 706). Herein, for example, when the remaining batterycharge of the radio terminal (UE) 30 is equal to a predeterminedthreshold or more, the radio base station (eNB) 31 does not change theconfiguration of the measurement method and the reporting method. On theother hand, when the remaining battery charge of the radio terminal (UE)30 is less than a predetermined threshold, the radio base station (eNB)31 gives an instruction for the reconfiguration so as to make the radioterminal report only the log of a sort with a high priority (Measurementlogging and reporting reconfiguration) (Step 707).

The radio terminal (UE) 30, which does not receive the newreconfiguration notification, transmits the measurement log to the radiobase station (eNB) 31 (Measurement log report) (Step 708). On the otherhand, the radio terminal (UE) 30 having received the new reconfigurationnotification performs the measurement log report (Measurement logreport) only for the log of a sort for which the radio terminal has beeninstructed to perform the reporting with a high priority (Step 708).And, the radio base station (eNB) 31 transmits all the receivedmeasurement logs or one part thereof to the NM 32 (Log report) (Step709).

This makes it possible to cause the radio terminal to perform themeasurement and the reporting without (excessively) increasing a load onthe radio terminal.

Additionally, also in this exemplary embodiment, similarly to the secondexemplary embodiment, the timing at which the NM 32 notifies (Policyindication) the measurement policy (Measurement policy) to the radiobase station (eNB) 31 is a timing after receiving the terminalcapability report (UE capability report); however, the timing is notlimited hereto, and other timings such as a timing prior to thereception of the terminal capability report (UE capability report) maybe used. Further, it is enough for the radio base station (eNB) 31 topreviously maintain the measurement policy (Measurement policy), and itis not indispensable that the NM 32 notifies (Policy indication) themeasurement policy (Measurement policy) when the radio base station(eNB) 31 maintains the measurement policy.

Next, an operation of the radio terminal (UE) will be explained.

FIG. 15 is an operational flowchart of the radio terminal (UE) 30.

At first, the radio terminal (UE) 30 receives the configuration of themeasurement method and reporting method (Measurement logging andreporting configuration) (Step 800).

When any condition of the BCCH error, the PCCH error, the RA failure,and the RLF is met (any of them is detected), the radio terminal (UE) 30starts an operation of performing the necessary indicated measurement atthe time of the above detection (Step 801). When even one of the aboveconditions is actually met, the radio terminal (UE) 30 performs themeasurement and positioning, and logs the measurement result and thelocation information as the log (Log measurement result and performlocalization (Steps 802 and 803).

When the amount of the logs that the radio terminal (UE) 30 storesbecomes a predetermined threshold or more (Amount of logging exceededthreshold?) (Step 804), the radio terminal (UE) 30 reports the remainingbattery charge of its own terminal and a sort of the log that it stores(Report remaining battery charge information and logging sort) as themeasurement status (Measurement status), and reports the transmissionbuffer situation simultaneously therewith (Send buffer status report(Step 805).

When the measurement log report is requested by the radio network side(Report requested by NW?) (Step 806, Yes), and the radio terminal (UE)30 does not receive a notification of the reconfiguration (Receive newconfiguration?) (Step 807, No), the radio terminal (UE) 30 performs themeasurement log report (Report measurement log (Step 809).

On the other hand, when the measurement log report is requested by theradio network side (Report requested by NW?) (Step 806, Yes), and theradio terminal (UE) 30 receives a notification of the reconfiguration(Receive new configuration?) (Step 807, Yes), the radio terminal (UE) 30reconfigures the measurement method, the logging method of themeasurement result, and the reporting method according to theinstruction (Update measurement, logging, and reporting configuration)(Step 808). And, the radio terminal (UE) 30 performs the measurement logreport related to the log of a newly indicated sort (Report measurementlog) (Step 809).

Next, an operation of the radio base station (eNB) 31 will be explained.FIG. 16 is an operational flowchart of the radio base station (eNB) 31.

At first, the radio base station (eNB) 31 notifies the configuration ofthe measurement method and the reporting method (Measurement logging andreporting configuration) (Step 900).

When the remaining battery charge and a sort of the log that the radioterminal (UE) 30 stores as the measurement status (Measurement status),and the buffer situation are reported by the radio terminal (UE) 30(Remaining battery charge, logging sorts and buffer status reported?)(Step 901, Yes), the radio base station (eNB) 31 determines whether toabort the measurement request for the radio terminal (UE) 30 (Cancelmeasurement request?) (Step 902). When aborting the measurement request,the radio base station (eNB) 31 transmits a message for aborting themeasurement (Send measurement cancel message) (Step 903).

On the other hand, when the radio base station (eNB) 31 does not let theradio terminal (UE) 30 abort the measurement, the radio base station(eNB) 31 determines whether or not the reconfiguration of themeasurement and the reporting of the radio terminal (UE) 30 is needed(Reconfiguration needed?) (Step 904). When it is not needed, the radiobase station (eNB) 31 transmits the information of the uplink radioresources for reporting the measurement log (Send UL grant) (Step 908).

On the other hand, when the reconfiguration of the measurement and thereporting of the radio terminal (UE) 30 is needed, the radio basestation (eNB) 31 reconfigures a sort of the log that it causes the radioterminal (UE) 30 to report, the measurement method and/or the reportingmethod, and the like (Decide log sort(s) to be reported, updatemeasurement, logging, and/or reporting configuration) (Steps 905 and906). And, the radio base station (eNB) 31 transmits an instruction forthe reconfiguration, and the uplink radio resource information forreporting the measurement log to the radio terminal (UE) (Sendreconfiguration message and UL grant) (Step 907).

Fifth Exemplary Embodiment

The fifth exemplary embodiment will be explained.

The case of supposing a system of the 3GPP LTE (Long Term Evolution)will be explained in the fifth exemplary embodiment. Additionally, eachof the radio terminal, the radio base station, and the NM assumes asimilar constitution, so explanation will be performed withconcentrating on different points. In this exemplary embodiment, it isassumed that the measurement and the reporting by the radio terminal areperiodically performed based on the timer to be notified from the radiobase station. A large difference in which the fifth exemplary embodimentdiffers from the above-described exemplary embodiments lies in a pointthat the radio terminal requests the reconfiguration of the measurementmethod and/or the reporting method based on the situation of the radioterminal itself.

FIG. 17 is a sequence diagram for explaining a specific operation of thefifth exemplary embodiment.

At first, the radio terminal (UE) 30 performs the terminal capabilityreport (UE capability report) (Step 1000).

The NM 32 notifies the measurement policy (Measurement policy) to theradio base station (eNB) 31 (Policy indication) (Step 1001).

The radio base station (eNB) 31 gives an instruction for configuring themeasurement method and the reporting method to the radio terminal (UE)30 according to the above policy (Measurement logging and reportingconfiguration) (Step 1002). At this time, the radio base station (eNB)31 sends a timer value (timer value) Tm of the interval of themeasurement (Msmnt interval Tm) by the radio terminal, and a timer value(timer value) Tr of the report interval (Report interval Tr) at whichthe measurement log is reported.

The radio terminal (UE) 30 performs the indicated measurement and logsthe measurement result at the measurement interval Tm (Msmnt interval)based on the notified timer value according to the indicated measurementmethod and reporting method (Measurement logging) (Step 1003). As atiming in which the timer starts, the timing just after notificationfrom the radio base station (eNB) 31 (Step 1002), the timing after alapse of a predetermined period since the above notification, and thelike are thinkable.

When the timer of the report interval Tr (Report interval) expires (Step1004), the radio terminal (UE) 30 performs the measurement status reportsuch as the remaining battery charge of its own radio terminal(Measurement status report) and the transmission buffer situation report(Buffer status report) (Step 1005). At this time, when the radioterminal (UE) 30 determines that performing the requested measurementand/or reporting causes a load on the terminal itself to become large,it makes a request for reconfiguring the measurement method and/orreporting method for alleviating the above load (for example, a requestfor making the interval of the measurement and/or the reporting long)(Measurement reconfiguration request).

The radio base station (eNB) 31 determines whether the remaining batterycharge of the radio terminal (UE) 30 is a predetermined threshold ormore based on the measurement status report (Measurement status report),and in addition determines whether to actually reconfigure themeasurement method and/or reporting method (Re-config decision) based ona request for the reconfiguration (Measurement reconfiguration request)(Step 1006). The radio base station (eNB) 31 does not reconfigure themeasurement interval Tm (Msmnt interval Tm) and the report interval Tr(Report interval Tr) when the remaining battery charge of the radioterminal (UE) 30 is equal to a predetermined threshold or more, anddecides a new measurement interval Tm′ (Msmnt interval Tm′>Tm) and a newreport interval Tr′ (Report interval Tr′>Tr), being intervals longerthan the measurement interval Tm (Msmnt interval Tm) and the reportinterval Tr (Report interval Tr), respectively, and reconfigures themwhen the remaining battery charge of the radio terminal (UE) 30 is lessthan the predetermined threshold. Or, the radio base station (eNB) 31may reconfigure the measurement interval and/or the report interval sothat each of them is made longer a little (for example, Tm′>Tm″>Tm,Tr′>Tr″>Tr) by taking a request for the reconfiguration by the radioterminal (UE) 30 into consideration even though the remaining batterycharge is a predetermined threshold or more. And, the radio base station(eNB) 31 notifies an instruction for the reconfiguration (Measurementlogging and reporting reconfiguration) and the radio resource (UL grant)with which the logged measurement result is reported (Step 1007).

The radio terminal (UE) 30 transmits the measurement log report(Measurement log report) to the radio base station (eNB) 31 with thereceived radio resource (Step 1008). And, the radio base station (eNB)31 transmits the received measurement log report to the NM 32 (Logreport) (Step 1009).

On the other hand, when receiving the reconfiguration notification, theradio terminal (UE) 30 reconfigures the notified new measurementinterval Tm′ (Msmnt interval Tm′) and report interval Tr′ (Reportinterval Tr′), and performs the measurement and the reporting at theseintervals thereafter (Step 1100).

This makes it possible to cause the radio terminal to perform themeasurement and the reporting without (excessively) increasing a load onthe radio terminal. Herein, as the request for the reconfiguration bythe radio terminal, a request for shifting the reporting timing so as toperform the reporting after a lapse of a certain period of time, arequest for performing the reporting after the communication situationhas improved, and the like in addition to the request for making theintervals of the measurement and/or the reporting long as shown in thisexemplary embodiment are thinkable.

Additionally, while the trigger of the measurement status report(Measurement status report) was explained as a timing in which themeasurement log report was triggered in the above-described explanation,the above trigger is not limited hereto. For example, the timing of themeasurement status report (Measurement status report) may be configuredindependently depending on the periodical technique, the technique ofthe event trigger, and the like. In addition, in a case of the eventtrigger, the event could be identical to an event used for reporting themeasurement log in some cases, or could be different in some cases.

Further, also in this exemplary embodiment, similarly to the secondexemplary embodiment, the timing at which the NM 32 notifies themeasurement policy (Measurement policy) to the radio base station (eNB)31 (Policy indication) is a timing after receiving the terminalcapability report (UE capability report); however, the timing is notlimited hereto, and other timings such as a timing prior to thereception of the terminal capability report (UE capability report) maybe used. Further, it is enough for the radio base station (eNB) 31 topreviously maintain the measurement policy (Measurement policy), and itis not indispensable that the NM 32 notifies (Policy indication) themeasurement policy (Measurement policy) when the radio base station(eNB) 31 maintains the measurement policy.

Modified Example of the Fifth Exemplary Embodiment

FIG. 18 is a sequence diagram for explaining a specific operation of themodified example of the fifth exemplary embodiment. A difference inwhich the modified example differs from the fifth exemplary embodimentlies in a point that the radio terminal requests the radio base stationto abort the measurement and/or the reporting when it has judged that anload on the radio terminal itself becomes large.

In FIG. 18, steps until Steps 1000 to 1004 are similar to those of FIG.17.

When the measurement log report is triggered (the reporting timerexpires in this exemplary embodiment), the radio terminal (UE) 30performs the measurement status report including, for example, theinformation such as the remaining battery charge (Measurement statusreport). At this time, in addition, when the radio terminal (UE) 30determines that the configured measurement method and/or the reportingmethod causes a load to become large, it requests the radio base station(eNB) 31 to abort the measurement (Measurement cancel request) (Step1010).

When the radio base station (eNB) 31 receives the above request foraborting the measurement, it determines whether to abort the measurementby the radio terminal (UE) 30 while taking the content of the receivedmeasurement status report into consideration likewise (Re-configdecision) (Step 1011). When the radio base station (eNB) 31 hasdetermined to cause the radio terminal (UE) 30 to abort the measurement,it transmits a notification for aborting the measurement to the radioterminal (UE) 30 (Measurement cancel) (Step 1012).

The radio terminal (UE) 30 clears the configuration of the measurementreports and the reporting method after receiving a notification foraborting the measurement, and aborts the measurement and the reporting(Clear measurement configuration) (Step 1013).

This makes it possible to cause the radio terminal to perform themeasurement and the reporting without (excessively) increasing a load onthe radio terminal.

Further, also in this exemplary embodiment, similarly to the secondexemplary embodiment, the timing at which the NM 32 notifies themeasurement policy (Measurement policy) to the radio base station (eNB)31 (Policy indication) is a timing after receiving the terminalcapability report (UE capability report); however, the timing is notlimited hereto, and other timings such as a timing prior to thereception of the terminal capability report (UE capability report) maybe used. Further, it is enough for the radio base station (eNB) 31 topreviously maintain the measurement policy (Measurement policy), and itis not indispensable that the NM 32 notifies (Policy indication) themeasurement policy (Measurement policy) when the radio base station(eNB) 31 maintains the measurement policy.

Sixth Exemplary Embodiment

FIG. 19 is a constitution view of the radio communication system in thesixth exemplary embodiment.

A UE (DM client) 600 corresponds to the radio terminal (UE) 30, a DM(Device Management) server 601 corresponds to the radio base station(eNB) 31, and an NM (Network Manager) 602 corresponds to the NM (NetworkManager) 32. And, respective units operate similarly to the radioterminal (UE) 30, the radio base station (eNB) 31, and the NM (NetworkManager) 32, respectively.

That is, the NM (Network Manager) 602 notifies a policy of themeasurement, the logging of the measurement result, and the reporting ofthe above logging to the DM (Device Management) server 601 (Policyindication). The DM server 601 notifies themeasurement/logging/reporting method to the UE 600, being a DM client(Measurement, logging and reporting configuration). The UE 600 reportsthe log of the measurement result/the terminal situation to the DMserver 601, and the DM server 601 reports all the measurement logsreported from the UE 600 or one part thereof to the upper NM 602 (Logreport).

Herein, it is a key point not to make the radio terminals perform themeasurement/reporting when a load on each of the radio terminals becomesexcessive in the above-described present invention. At this time, themethod is also thinkable of not making all these terminals perform themeasurement and/or the report when all the terminals are in an identicalsituation. With the regard to the reporting, it is enough to make theradio terminal perform the reporting at a time point when the terminalsituation is improved (for example, the communication quality is good,and the battery is recovered to a predetermined value). However,basically, it is meaningful to perform the measurement at the indicatedtime point and location, whereby it is meaningless to make the radioterminal perform the measurement at a time point when the terminalsituation is improved in some cases. For this, with regard to themeasurement, it is also required to instruct the measurement by affixingthe priority among the terminals even though the load becomes excessive.However, it is not that one part of the terminals is made perform themeasurement for a long period, but that the load is dispersed among theterminals.

Additionally, in all the above-described exemplary embodiments, thepolicy of the measurement and the reporting was notified from the uppernetwork node (NM) to the radio base station (eNB); however, thenotification is not limited hereto. For example, the radio base station(eNB) itself may decide and configure the policy in some cases, or whiletaking the policy notified from the NM into consideration, the radiobase station (eNB) may changes the above policy.

Further, while an example of the case in which the radio terminalactually performed the measurement and the reporting under (in a cellof) the radio base station having notified the configuration of themeasurement method and the reporting method was shown in all theabove-described exemplary embodiments, the application scope of thepresent invention is not limited hereto. For example, it is possible forthe radio terminal to perform the operation as shown in theabove-described exemplary embodiments so long as the above configurationis valid even after moving to cells of the other radio base stationsfrom the cell of the radio base station having notified theconfiguration of the measurement method and the reporting method.

In addition, while the above-described exemplary embodiments basicallysupposed a system of the 3GPP LTE, the application scope of the presentinvention is not limited hereto. For example, the present invention isapplicable to UMTS (Universal Mobile Telecommunication System) to berepresented by WCDMA (Wideband Code Division Multiple Access), WiMAX(Worldwide interoperability for Microwave Access) and the like.

Further, while each unit was constituted with hardware in theabove-described exemplary embodiments, it may be constituted with aprogram that causes an information processor (CPU) to execute theprocesses of the above-described operations.

Above, although the present invention has been particularly describedwith reference to the preferred embodiments and the examples, it shouldbe readily apparent to those of ordinary skill in the art that thepresent invention is not always limited to the above-mentionedembodiment and examples, and changes and modifications in the form anddetails may be made without departing from the spirit and scope of theinvention.

Further, the content of the above-mentioned exemplary embodiments can beexpressed as follows.

(Supplementary note 1) A radio communication system, comprising:

configuration notifying means that notifies a radio terminal ofconfiguration information related to at least one of collection ofmeasurement information and reporting of said measurement information toa radio network by the radio terminal;

status notifying means notifies said radio network of a status relatedto at least one of the collection and the reporting of said measurementinformation by said radio terminal; and

reconfiguring means that receives said status, and determines whether ornot to reconfigure said configuration information.

(Supplementary note 2) A radio communication system according toSupplementary note 1, wherein said status is at least one of informationrelated to a situation of the radio terminal and information related toa collection situation of the measurement information.

(Supplementary note 3) A radio communication system according toSupplementary note 1 or Supplementary note 2, wherein said status istransmitted for a purpose of reconfiguring said configurationinformation.

(Supplementary note 4) A radio communication system according to one ofSupplementary note 1 to Supplementary note 3, comprising a measurementexecuting means that executes at least one of said collection and saidreporting with the reconfigured configuration information.

(Supplementary note 5) A radio communication system according to one ofSupplementary note 2 to Supplementary note 4, wherein said informationrelated to the situation of the radio terminal is at least one of aremaining battery charge of the radio terminal, location information ofthe radio terminal, received strength of a positioning radio wave (GPSradio wave) at the radio terminal, a communication quality of the radioterminal, and a moving velocity of the radio terminal, or a combinationthereof.

(Supplementary note 6) A radio communication system according to one ofSupplementary note 2 to Supplementary note 5, wherein said informationrelated to the collection situation of the measurement information is atleast one of a sort of the measurement information collected by theradio terminal, an amount of the measurement information collected bythe radio terminal, a summary of the measurement information collectedby the radio terminal, and positioning performance information of theradio terminal, or a combination thereof.

(Supplementary note 7) A radio communication system according toSupplementary note 6, wherein said summary of the measurementinformation is at least one of said sort of the measurement information,for each sort of said measurement information, a number of themeasurement, a measurement time, and location information of the radioterminal at a point in time when the measurement has been performed, ora combination thereof.

(Supplementary note 8) A radio communication system according to one ofSupplementary note 1 to Supplementary note 7, wherein said reconfiguringmeans reconfigures at least one of an interval of the collection of saidmeasurement information and/or the reporting of said measurementinformation, a trigger of the collection of said measurement informationand/or the reporting of said measurement information, a sort of saidmeasurement information to be collected and/or a sort of saidmeasurement information to be reported, and a collection amount of saidmeasurement information and/or an amount of said measurement informationto be reported, or a combination thereof.

(Supplementary note 9) A radio communication system according to one ofSupplementary note 1 to Supplementary note 8, wherein said statusnotifying means notifies said status at anyone of a periodical timing ofthe collection and/or the reporting of said measurement information, atiming of the collection and/or the reporting of said measurementinformation by a predetermined trigger, a timing pre-configured by saidradio network, and a timing in which a predetermined event for notifyingsaid status has occurred.

(Supplementary note 10) A radio communication system according to one ofSupplementary note 1 to Supplementary note 9, wherein said statusnotifying means indicates a measurement method and/or a reporting methodof said measurement information, or instructs an abort of themeasurement and/or the reporting when notifying said status.

(Supplementary note 11) A radio communication system according to one ofSupplementary note 1 to Supplementary note 10, wherein said radionetwork includes at least one of a radio base station, a base stationcontroller, a DM (Device Manager), and an NM (Network Manager).

(Supplementary note 12) A radio communication method according to one ofSupplementary note 1 to Supplementary note 11, comprising transmittingsaid status for a purpose of determining whether or not thereconfiguration of the configuration information.

(Supplementary note 13) A radio communication method according to one ofSupplementary note 1 to Supplementary note 12, comprising transmittingsaid status for a purpose of considering a situation of the radioterminal.

(Supplementary note 14) A radio communication method according to one ofSupplementary note 1 to Supplementary note 13, comprising transmittingsaid status for a purpose of considering a situation related to theinformation collection by the radio terminal.

(Supplementary note 15) A radio communication system, comprising:

status notifying means that notifies a status related to at least one ofcollection and reporting of measurement information by a radio terminal;and controlling means that receives said status, and controls at leastone of the collection of the measurement information and the reportingof said measurement information to a radio network by said radioterminal.

(Supplementary note 16) A radio terminal, comprising:

receiving means that receives configuration information related to atleast one of collection of measurement information and reporting of saidmeasurement information to a radio network; and

status notifying means notifies said radio network of a status relatedto at least one of the collection and the reporting of said measurementinformation by its own terminal, wherein when the configurationinformation reconfigured by said radio network having received saidstatus is transmitted from said radio network, said receiving meansreceives the above configuration information.

(Supplementary note 17) A radio terminal according to Supplementary note16, wherein said status is at least one of information related to asituation of the radio terminal and information related to a collectionsituation of the measurement information.

(Supplementary note 18) A radio terminal according to Supplementary note16 or Supplementary note 17, wherein said status is transmitted for apurpose of reconfiguring said configuration information.

(Supplementary note 19) A radio terminal according to one ofSupplementary note 16 to Supplementary note 18, comprising a measurementexecuting means that executes at least one of said collection and saidreporting with the reconfigured configuration information.

(Supplementary note 20) A radio terminal according to one ofSupplementary note 17 to Supplementary note 19, wherein said informationrelated to the situation of the radio terminal is at least one of aremaining battery charge of the radio terminal, location information ofthe radio terminal, received strength of a positioning radio wave (GPSradio wave) at the radio terminal, a communication quality of the radioterminal, and a moving velocity of the radio terminal, or a combinationthereof.

(Supplementary note 21) A radio terminal according to one ofSupplementary note 17 to Supplementary note 20, wherein said informationrelated to the collection situation of the measurement information is atleast one of a sort of the measurement information collected by theradio terminal, an amount of the measurement information collected bythe radio terminal, a summary of the measurement information collectedby the radio terminal, and positioning performance information of theradio terminal, or a combination thereof.

(Supplementary note 22) A radio terminal according to Supplementary note21, wherein said summary of the measurement information is at least oneof said sort of the measurement information, for each sort of saidmeasurement information, a number of the measurement, a measurementtime, and location information of the radio terminal at a point in timewhen the measurement has been performed, or a combination thereof.

(Supplementary note 23) A radio terminal according to one ofSupplementary note 16 to Supplementary note 22, wherein said receivingmeans receives said reconfiguration information having at least one ofan interval of the collection of said measurement information and/or thereporting of said measurement information, a trigger of the collectionof said measurement information and/or the reporting of said measurementinformation, a sort of said measurement information to be collectedand/or a sort of said measurement information to be reported, and acollection amount of said measurement information and/or an amount ofsaid measurement information to be reported, or a combination thereofreconfigured therein.

(Supplementary note 24) A radio terminal according to one ofSupplementary note 16 to Supplementary note 23, wherein said statusnotifying means notifies said status at anyone of a periodical timing ofthe collection and/or the reporting of said measurement information, atiming of the collection and/or the reporting of said measurementinformation by a predetermined trigger, a timing pre-configured by saidradio network, and a timing in which a predetermined event for notifyingsaid status has occurred.

(Supplementary note 25) A radio terminal according to one ofSupplementary note 16 to Supplementary note 24, wherein said statusnotifying means indicates a measurement method and/or a reporting methodof said measurement information, or instructs an abort of themeasurement and/or the reporting when notifying said status.

(Supplementary note 26) A radio terminal according to one ofSupplementary note 16 to Supplementary note 25, wherein said radionetwork includes at least one of a radio base station, a base stationcontroller, a DM (Device Manager), and an NM (Network Manager).

(Supplementary note 27) A radio communication method according to one ofSupplementary note 16 to Supplementary note 26, comprising transmittingsaid status for a purpose of determining whether or not thereconfiguration of the configuration information.

(Supplementary note 28) A radio communication method according to one ofSupplementary note 16 to Supplementary note 27, comprising transmittingsaid status for a purpose of considering a situation of the radioterminal.

(Supplementary note 29) A radio communication method according to one ofSupplementary note 16 to Supplementary note 28, comprising transmittingsaid status for a purpose of considering a situation related to theinformation collection by the radio terminal.

(Supplementary note 30) A radio terminal in a communication system forcontrolling, by a radio network, at least one of collection ofmeasurement information and reporting of said measurement information tothe radio network by the radio terminal, comprising a status notifyingmeans that notifies a status related to at least one of the collectionand the reporting of said measurement information by its own terminal tosaid radio network.

(Supplementary note 31) A radio communication method, comprising:

notifying a radio terminal of configuration information related to atleast one of collection of measurement information and reporting of saidmeasurement information to a radio network by the radio terminal;

notifying said radio network of a status related to at least one of thecollection and the reporting of said measurement information by saidradio terminal; and receiving said status and determining whether or notto reconfigure said configuration information.

(Supplementary note 32) A radio communication method according toSupplementary note 31, wherein said status is at least one ofinformation related to a situation of the radio terminal and informationrelated to a collection situation of the measurement information.

(Supplementary note 33) A radio communication method according toSupplementary note 31 or Supplementary note 32, comprising transmittingsaid status for a purpose of reconfiguring said configurationinformation.

(Supplementary note 34) A radio communication method according to one ofSupplementary note 31 to Supplementary note 33, comprising executing atleast one of said collection and said reporting with the reconfiguredconfiguration information.

(Supplementary note 35) A radio communication method according to one ofSupplementary note 32 to Supplementary note 34, wherein said informationrelated to the situation of the radio terminal is at least one of aremaining battery charge of the radio terminal, location information ofthe radio terminal, received strength of a positioning radio wave (GPSradio wave) at the radio terminal, a communication quality of the radioterminal, and a moving velocity of the radio terminal, or a combinationthereof.

(Supplementary note 36) A radio communication method according to one ofSupplementary note 32 to Supplementary note 35, wherein said informationrelated to the collection situation of the measurement information is atleast one of a sort of the measurement information collected by theradio terminal, an amount of the measurement information collected bythe radio terminal, a summary of the measurement information collectedby the radio terminal, and positioning performance information of theradio terminal, or a combination thereof.

(Supplementary note 37) A radio communication method according toSupplementary note 36, wherein said summary of the measurementinformation is at least one of said sort of the measurement information,for each sort of said measurement information, a number of themeasurement, a measurement time, and location information of the radioterminal at a point in time when the measurement has been performed, ora combination thereof.

(Supplementary note 38) A radio communication method according to one ofSupplementary note 31 to Supplementary note 37, comprising reconfiguringat least one of an interval of the collection of said measurementinformation and/or the reporting of said measurement information, atrigger of the collection of said measurement information and/or thereporting of said measurement information, a sort of said measurementinformation to be collected and/or a sort of said measurementinformation to be reported, and a collection amount of said measurementinformation and/or an amount of said measurement information to bereported, or a combination thereof.

(Supplementary note 39) A radio communication method according to one ofSupplementary note 31 to Supplementary note 38, comprising notifyingsaid status at anyone of a periodical timing of the collection and/orthe reporting of said measurement information, a timing of thecollection and/or the reporting of said measurement information by apredetermined trigger, a timing pre-configured by said radio network,and a timing in which a predetermined event for notifying said statushas occurred.

(Supplementary note 40) A radio communication method according to one ofSupplementary note 31 to Supplementary note 39, comprising indicating ameasurement method and/or a reporting method of said measurementinformation, or instructing an abort of the measurement and/or thereporting when notifying said status.

(Supplementary note 41) A radio communication method according to one ofSupplementary note 31 to Supplementary note 40, wherein said radionetwork includes at least one of a radio base station, a base stationcontroller, a DM (Device Manager), and an NM (Network Manager).

(Supplementary note 42) A radio communication method according to one ofSupplementary note 31 to Supplementary note 41, comprising transmittingsaid status for a purpose of determining whether or not thereconfiguration of the configuration information.

(Supplementary note 43) A radio communication method according to one ofSupplementary note 31 to Supplementary note 42, comprising transmittingsaid status for a purpose of considering a situation of the radioterminal.

(Supplementary note 44) A radio communication method according to one ofSupplementary note 31 to Supplementary note 43, comprising transmittingsaid status for a purpose of considering a situation related to theinformation collection by the radio terminal.

(Supplementary note 45) A radio communication method, comprising:

notifying a status related to at least one of collection and reportingof measurement information by a radio terminal to a radio network; and

receiving said status, and controlling at least one of the collection ofthe measurement information and the reporting of said measurementinformation to the radio network by said radio terminal.

(Supplementary note 46) A radio network, comprising:

configuration notifying means that notifies a radio terminal ofconfiguration information related to at least one of collection ofmeasurement information and reporting of said measurement information toa radio network by the radio terminal; and

reconfiguring means that receives, from said radio terminal, a statusrelated to at least one of the collection and the reporting of saidmeasurement information by said radio terminal, and determines whetheror not to reconfigure said configuration information.

(Supplementary note 47) A program for causing an information processingdevice to execute the processes of:

notifying a radio terminal of configuration information related to atleast one of collection of measurement information and reporting of saidmeasurement information to a radio network by the radio terminal;

receiving from said radio terminal a status related to at least one ofthe collection and the reporting of said measurement information by saidradio terminal; and

receiving said status, and determining whether or not to reconfiguresaid configuration information.

REFERENCE SIGNS LIST

-   -   1 radio terminal (UE)    -   2 radio network    -   11 logging/reporting capability memory    -   12 terminal situation/log situation reporting function    -   13 measuring & measurement result logging function    -   14 measurement reporting function    -   21 OAM policy & OAM requirement enforcement function    -   22 log storage function    -   30 radio terminal    -   31 radio base station    -   32 NM    -   600 UE (DM client)    -   601 DM server    -   602 NM

1. A method for a radio terminal communicating with a radio network, themethod comprising: detecting radio link failure; storing radio linkfailure related information that includes: (a) measurement resultsrelated to the radio link failure, and (b) location information; andtransmitting to the radio network, without reception by the radioterminal of a report request for requesting a report of the radio linkfailure related information, radio link failure status informationindicating that the radio terminal has the radio link failure relatedinformation, wherein the radio link failure status information does notinclude the radio link failure related information.
 2. The methodaccording to claim 1, further comprising: transmitting the report of theradio link failure related information, from the radio terminal to theradio network, if the radio terminal receives the report request forrequesting the report of the radio link failure related information andthe radio terminal has the radio link failure related information. 3.The method according to claim 1, wherein the measurement results relatedto the radio link failure comprises at least one of: Reference SignalsReceived Power (RSRP) of a cell in which the radio link failure wasdetected, and Reference Signals Received Quality (RSRQ) of the cell inwhich the radio link failure was detected.
 4. The method according toclaim 1, wherein the transmitting the radio link failure statusinformation comprises transmitting a Radio Resource Control (RRC)message comprising the radio link failure status information, whereinthe RRC message does not include any radio link failure relatedinformation.
 5. The method according to claim 1, further comprising:discarding the radio link failure related information after a lapse of apredetermined period from a time after the detecting the radio linkfailure, if the radio terminal does not receive the report request forrequesting the report of the radio link failure related information. 6.A radio terminal that communicates with a radio network, the radioterminal comprising: a transceiver; and, at least one processorconfigured to: detect radio link failure; store radio link failurerelated information that includes: (a) measurement results related tothe radio link failure, and (b) location information; and control thetransceiver to transmit, to the radio network, without reception by theradio terminal of a report request for requesting a report of the radiolink failure related information, radio link failure status informationindicating that the radio terminal has radio link failure relatedinformation, wherein the radio link failure status information does notinclude the radio link failure related information.
 7. The radioterminal according to claim 6, wherein the at least one processor isfurther configured to: transmit the report of the radio link failurerelated information from the radio terminal to the radio network, if theradio terminal receives the report request for requesting the report ofthe radio link failure related information and the radio terminal hasthe radio link failure related information.
 8. The radio terminalaccording to claim 6, wherein the measurement results related to theradio link failure comprises at least one of: Reference Signals ReceivedPower (RSRP) of a cell in which the radio link failure was detected, andReference Signals Received Quality (RSRQ) of the cell in which the radiolink failure was detected.
 9. The radio terminal according to claim 6,wherein the at least one processor is configured to transmit the radiolink failure status information in a Radio Resource Control (RRC)message comprising the radio link failure status information, whereinthe RRC message does not include any radio link related information. 10.The radio terminal according to claim 6, wherein the at least oneprocessor is further configured to discard the radio link failurerelated information after a lapse of a predetermined period after theradio link failure is detected, if the radio terminal does not receivethe report request for requesting the report of the radio link failurerelated information.
 11. The method according to claim 1, furthercomprising: receiving the report request for requesting a report of theradio link failure related information after the transmitting the radiolink failure status information, and transmitting the report of theradio link failure related information after the receiving the reportrequest.
 12. The radio terminal according to claim 6, wherein the atleast one processor is further configured to: control the transceiver toreceive the report request for requesting a report of the radio linkfailure related information after transmission of the radio link failurestatus information; and transmit the report of the radio link failurerelated information after receipt of the report request.